As the topic. Illusory Wall specifically states that you cannot see through it even when you save the spell. Does the spell True Seeing or the ability Truesight allow you to see what's on the other side?
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True Seeing pretty much sees through any illusion whatsoever. The text for illusory wall is mostly for regular detection abilities such as detect magic, clairaudience/clairvoyance, etc.
Illusory Wall is best served to delay or avoid regular detection. If the party suspects that it's illusory wall, it's pretty much done it's purpose.
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My understanding is that Illusory Wall's text is a specific rule that overrides the general rule regarding Illusion(figment) and successful saves.
General rule:
Creatures encountering an illusion usually do not receive saving throws to recognize it as illusory until they study it carefully or interact with it in some fashion.
A successful saving throw against an illusion reveals it to be false, but a figment or phantasm remains as a translucent outline.
Specific rule trumping the General rule above:
School illusion (figment);
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This spell creates the illusion of a wall, floor, ceiling, or similar surface. It appears absolutely real when viewed, but physical objects can pass through it without difficulty. When the spell is used to hide pits, traps, or normal doors, any detection abilities that do not require sight work normally. Touch or a probing search reveals the true nature of the surface, though such measures do not cause the illusion to disappear. Although the caster can see through his illusory wall, other creatures cannot, even if they succeed at their will save (but they do learn that it is not real).
For normal Illusion(figment)s like a Silent Image of a wall, you can't see through it unless you disbelieve it first. Illusory Wall is special in that if you disbelieve it, you still can't see through it.
True seeing lets you see through all Illusions, regardless of whether you disbelieved them or not.
I'm not sure of that due to the nature of illusory wall. True seeing let's you see through illusions but it doesn't negate concealment I.e. You can't see through fog or a regular wall and illusory wall states even if the person knows it's an illusion you can't see through it unless your the caster. Personally I'd say true seeing automatically tells you it's an illusion but won't let you see through it. Seeing through an illusion to me means you identify it's an illusion not literally seeing THROUGH it.
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Seeing through an illusion to me means you identify it's an illusion not literally seeing THROUGH it.
That then makes me curious how you interpret true seeing's "see through normal and magical darkness". Does it just let them know that it's dark, rather than letting them actually see? If it does let them actually see, then I would then want to ask what basis you have for saying that "see through" means one thing when referring to darkness but means something completely different when referring to illusions. If you don't have a good answer to that, then your position sort of falls apart.
Malag has a good point (and if he were my GM, I would totally accept that as a defensible ruling)... I'd say that Illusory Wall is a 4th level spell - and compared to lots of other spells that might give you similar concealment effects - the real point of this one is this non-disappearance clause and I'd prefer to let it stand as a physical illusion that you can't see through even with true seeing.
Why? Because imagine a spell called "Wall of Light" (or if you prefer, "Wall of Two-Way Fog"). The point of the spell is that it creates a wall of light that characters on one side can see through, but enemies on the other side cannot. For "how it works", consider that it actually is creating light. What level would this spell be?
For comparison, "Tiny Hut" is a third level spell that has a similar effect to concealment (plus other effects!) True Seeing cannot penetrate a Tiny Hut, as it isn't an illusion (although I'm sure there are GMs who would rule otherwise, under the "magic effects" part of the line, but I digress).
TL/DR: for a 4th level spell, this concealment should stand; True Seeing can't beat concealment from 1st level spell effects, and the point of this 4th level spell is how much stronger it is than those in terms of control (thin effect, can be seen through by caster only).
(And arguing against myself - the permanent duration - meaning this could hide traps and secret doors, makes me want to say I'm wrong! This is one reason why my wizards always create a spell to create this kind of concealment without dealing with these issues: my "Wall of Light")